To solve the equation \( ax + b = 0 \) for \( x \), follow these steps:
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Subtract \( b \) from both sides: \[ ax = -b \]
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Divide both sides by \( a \) (assuming \( a \neq 0 \)): \[ x = -\frac{b}{a} \]
So, the solution for \( x \) is: \[ x = -\frac{b}{a} \]